It was based upon the book written by Lawrence Earl. The film was known in the US by the alternative titles Battle Hell, Escape of the Amethyst, Their Greatest Glory and Yangtze Incident. Non-English language titles include the direct German translation of Yangtse-Zwischenfall, and Commando sur le Yang-Tse in France. In Belgium it was known as Feu sur le Yangtse (French) and Vuur op de Yangtse (Flemish/Dutch), both meaning "Fire on the Yangtse".

Plot

On 19 April 1949, the Royal Navy frigate HMS Amethyst sails up the Yangtze River on her way to Nanking, the Chinese capital, to deliver supplies to the British Embassy. Suddenly, without warning, People's Liberation Army (PLA) shore batteries open fire and after a heavy engagement, Amethyst lies grounded in the mud and badly damaged. Fifty-four of her crew are dead, dying or seriously wounded while others deteriorate from the tropical heat and the lack of essential medicines. The local Communist official Colonel Peng (played by Akim Tamiroff) is adamant: either accept responsibility for the entire incident, or the Amethyst will remain his prisoner.

After an attempt by HMS Consort to tow Amethyst off the mud bank fails, Lieutenant-Commander......
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